discovery of printer type

Inspectron.Epson/DiscoveryService.cs

@@ -1,5 +1,6 @@
 using System.Net;
 using System.Net.Sockets;
+using Microsoft.Extensions.Logging;
 
 namespace Inspectron.Epson;
 
@@ -8,6 +9,12 @@ public class DiscoveryService : IDiscoveryService
     private const int DiscoveryPort = 3289;
     private const string DiscoveryMessage = "EPSONQ";
     private const int MessageLength = 14;
+    private readonly ILogger? _logger;
+
+    public DiscoveryService(ILogger? logger = null)
+    {
+        _logger = logger;
+    }
 
     /// <summary>
     /// Discovers Epson printers on the local network using UDP broadcast
@@ -52,12 +59,16 @@ public class DiscoveryService : IDiscoveryService
                     // Check if we've already discovered this printer
                     if (!discoveredPrinters.Any(p => p.IPAddress.Equals(result.RemoteEndPoint.Address)))
                     {
+                        var ipAddress = result.RemoteEndPoint.Address.ToString();
                         var printer = new DiscoveredPrinter
                         {
-                            IPAddress = result.RemoteEndPoint.Address.ToString(),
+                            IPAddress = ipAddress,
                             DiscoveredAt = DateTime.UtcNow
                         };
 
+                        // Try to get printer model by connecting and querying
+                        printer.ModelName = await GetPrinterModelAsync(ipAddress);
+
                         discoveredPrinters.Add(printer);
                         onPrinterDiscovered?.Invoke(printer);
                     }
@@ -91,6 +102,51 @@ public class DiscoveryService : IDiscoveryService
         msg[10] = 0x10;
         return msg;
     }
+
+    /// <summary>
+    /// Connects to a printer and retrieves its model name
+    /// </summary>
+    private async Task<string?> GetPrinterModelAsync(string ipAddress, int port = 9100)
+    {
+        try
+        {
+            _logger?.LogDebug("Connecting to printer at {IP} to retrieve model", ipAddress);
+
+            await using var epsonPrinter = new EpsonPrinter(_logger);
+            await epsonPrinter.ConnectAsync(ipAddress, port, timeoutSeconds: 3);
+
+            var printerId = await epsonPrinter.GetPrinterIdAsync();
+            if (printerId.HasValue)
+            {
+                var modelName = GetModelNameFromId(printerId.Value);
+                _logger?.LogDebug("Printer at {IP} identified as {Model} (ID: 0x{Id:X2})",
+                    ipAddress, modelName, printerId.Value);
+                return modelName;
+            }
+
+            _logger?.LogDebug("Could not retrieve printer ID from {IP}", ipAddress);
+            return null;
+        }
+        catch (Exception ex)
+        {
+            _logger?.LogWarning(ex, "Failed to get printer model from {IP}", ipAddress);
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// Converts a printer ID byte to a model name string
+    /// </summary>
+    private static string GetModelNameFromId(byte printerId)
+    {
+        return printerId switch
+        {
+            0x01 => "TM-T30III",
+            0x0D => "TM-U220II",
+            0x13 => "TM-U220II",
+            _ => $"Unknown (0x{printerId:X2})"
+        };
+    }
 }